CRITICAL 9.8 Microsoft

CVE-2025-21307

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

Microsoft Security Update 2025-Jan: Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

Affected Products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems

References

Published: 2025-01-14 · Source: Microsoft · Feed updated: 2026-09-25

This critical severity vulnerability with a CVSS score of 9.8 was published on 2025-01-14 via Microsoft. Affected: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 5 more.

Risk Timeline

CVE Disclosed2025-01-14 · 619 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21307

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2025-21307

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-33824	Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vul	CRITICAL	9.8
CVE-2025-47981 PoC	SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vu	CRITICAL	9.8
CVE-2026-41089	Windows Netlogon Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-41096	Windows DNS Client Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-68839	Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-69276	Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability	CRITICAL	9.8

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